This shows how to easily copy data between back ends as described in Database abstraction with google apps script
The library reference is 

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Example

If you are using Database abstraction with google apps script, changing back ends is easy. Let’s say you are using scriptDB, but want to migrate your data to Datastore it’s pretty straightforward. Your applications won’t need to change much since your queries will all have been abstracted. Here’s how to copy over.  We’re using DataStore so we need an Oauth2 pattern and your datastore setup as described in Datastore driver

 

See more like this in Database abstraction with google apps script and Datastore driver

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